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Answer :
We have: y + 3 = 10
⇒y + 3 - 3 = 10 - 3 (subtracting 3 on both sides)
⇒ y = 7
Check:
Keep y=7 in the given equation:
L.H.S= y+3=7+3=10=R.H.S
Hence we have y=7 as the solution.